title: The solid solution series (GeTe)x(LiSbTe2)2 (1 ≤ x ≤ 11) and the thermoelectric properties of (GeTe)11(LiSbTe2)2.
abstract: Exchanging one Ge(2+) with two Li(+) per formula unit in (GeTe)n(Sb2Te3) (n = 1, 2, 3, ...) eliminates cation vacancies, because it leads to an equal number of cations and anions. This substitution results in the solid solution (GeTe)x(LiSbTe2)2 (with x = n - 1, but n not necessarily an integer). For x < 6, these stable compounds crystallize in a rock-salt-type structure with random cation disorder. Neutron data show that a small fraction of Ge occupies tetrahedral voids for x = 2 and 3. For x > 6, (GeTe)x(LiSbTe2)2 forms a GeTe-type structure that shows a phase transition to a cubic high-temperature phase at ca. 280 °C. The thermoelectric properties of (GeTe)11(LiSbTe2)2 have been investigated and show that this compound is a promising thermoelectric material with a ZT value of 1.0 at 450 °C. The high ZT value of the thermodynamically stable compound is caused by a low phononic contribution to the thermal conductivity; probably, Li acts as a "pseudo-vacancy".
authors.affiliation: LMU Munich , Department of Chemistry, Butenandtstr. 5-13 (D), 81377 Munich, Germany.
authors.forename: Thorsten
authors.initials: T
authors.lastname: Schröder
authors.forename: Stefan
authors.initials: S
authors.lastname: Schwarzmüller
authors.forename: Christian
authors.initials: C
authors.lastname: Stiewe
authors.forename: Johannes
authors.initials: J
authors.lastname: de Boor
authors.forename: Markus
authors.initials: M
authors.lastname: Hölzel
authors.forename: Oliver
authors.initials: O
authors.lastname: Oeckler